Chair arm



FIG. 1 is a front perspective view of a chair arm showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a right-hand side elevational view;

FIG. 4 is a left-hand side elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a top plan view; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a chair arm, as shown and described. 